Thermal circuit-closer and indicator



(No Model.)

J. L. BRADLEY.

THERMAL CIRCUIT CLOSER AND INDICATOR.

No'. 498,153. Patented May 23, 1893.

UNITED STATES PATENT OFFICE.

JAY L. BRADLEY, OF ST. LOUIS, MISSOURI.

THERMAL CIRCUIT-CLOSER AND INDICATOR.

SPECIFICATION forming part of Letters Patent No. 498,153, dated May 23,1893.

Application filed December 5, 1892. Serial No. 454.081. (No model.)

To aZZ whom it may concern.-

Be it known that I, JAYL.BRADLEY,of the city of St. Louis,in the Stateof Missouri,have invented a certain new and useful Improvement inElectric Indicators, of which the following is a description, referencebeing had to the accompanying drawings, forming part of thisspecification.

My invention relates to an improved indicator which will signal theexactfioor of a building where fire exists.

My invention consists in features of novelty hereinafter fully describedand pointed out in the claims.

Figure I is an elevation illustrative of my invention, and showing themovable plug or object in its normal upper position. Fig. III is asimilar view, showing the plug or movable object in its lower position.Fig. II is a vertical section taken on line IIII Fig. I. Fig. IV is atransverse section taken on line IV'IV Fig. II.

Referring to the drawings, A represents a guide or support of somenon-conducting material, and having a base B by which it is secured inplace. The part A is preferably made in the form of a cylinder withslots 0 and D in its sides.

3 represents a gravitating block or object movable by gravity whenreleased, and located within the support A and guided therein by itssides fitting in the slots 0. This block or object 3 is provided at itslower end with a fusible plug 4 and at its upper end with a stop orcross piece 5. Between the plug and the stop, the block is provided witha number of contact points 2. The end of the plug,

stop, and contact points fit and move in the slots D of the support A.

1 represents contact points secured to or fitting in the support A andto which the electric wires are connected. Upon these points 1 thefusible plug 4 rests, as shown in Figs. I

and II, and by this means the block 3 is held in its upper position inthe support A, the electric circuit being closed as long as the plug 4rests on the points 1.

The operation is as follows: Should the temperature in a room rise abovea certain point the plugs 41: will fuse, and the block 3 will drop untilthe stop 5 comes against the points 1, again closing the circuit. As theblock 3 falls the points 2 engage the points 1 and slip past throughthem, the circuit being closed each time, and by providing the propernumber of these points 2 to correspond with the number of the floor uponwhich the indicator is placed, the signal given will indicate upon whatfloor of the building the tire is located.

I claim as my invention- 1. In an electric indicator, the combination ofcontact points 1, a movable object 3 having contact points 2, andfusible plugs 4, substantially as and for the purpose set forth.

2. In an electric indicator, the combination of contact points 1, amovable object 3 having contact points 2, and a fusible plug 4:, andstop 5, substantially as and for the purpose set forth.

3. In an electric indicator, the combination of the support A havingslots 0 and D, movable object3 fittingin said support and guided by saidslots 0 and provided with a fusible plug 4., contact points 2, and astop 5, all fitting and moving in said slots D, and contacts 1 fittingin said support, and upon which said fusible plug 4 and stop 5 areadapted to rest, and against which said contact points 2 are adapted toengage, substantially as and for 80 the purpose set forth.

JAY L. BRADLEY.

In presence of- ALBERT M. EBERSOLE,

ED. S. KNIGHT.

